Analog Devices Inc./Maxim Integrated MAX6709MUB+T

Overview

The MAX6709MUB+T from Maxim Integrated is a quad voltage monitor IC for multivoltage systems, featuring four independent active-low open-drain outputs with 10µA internal pullup to VCC, factory-trimmed thresholds for 3.0V (10% tolerance) and adjustable inputs down to 0.62V, and operation from 2.0V to 5.5V supply - used in desktop computers and telecom power supervision.

For engineers reviewing the MAX6709MUB+T datasheet, MAX6709MUB+T pinout, MAX6709MUB+T application, or MAX6709MUB+T equivalent, key selection considerations include its 3.0V nominal input with ±10% trip threshold, adjustable monitoring capability on three inputs, low 35µA typical supply current, and 10-pin µMAX package compatibility with wire-ORed power-good signaling.

Technical Context

The MAX6709MUB+T implements four precision comparators with an internal 0.62V bandgap reference and factory-laser-trimmed resistor-divider networks for fixed-threshold inputs. Its IN2 pin is configured for 3.0V nominal monitoring with 10% tolerance (trip at 2.55V–2.70V), while IN1, IN3, and IN4 are adjustable via external resistor dividers referenced to the same 0.62V threshold.

Hysteresis is built-in at 0.3×V_TH, eliminating need for external feedback; undervoltage lockout forces all PWRGD outputs low when VCC drops below 2.0V; each output drives low when its respective input falls below its programmed threshold, supporting independent power-good assertion per rail.

Key Specifications

Pinout & Package

Package: 10-pin µMAX (3.0mm × 3.0mm, 0.6mm height), lead-free, RoHS-compliant, exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage monitoring applications.

Compared with MAX6714CUB+T and TPS3307-33DGNR, the MAX6709MUB+T uniquely delivers four independent, configurable PWRGD outputs in a 3mm × 3mm package with sub-35µA quiescent current - making it the sole option for space-limited multivoltage systems requiring discrete rail-by-rail power-good assertion without reset timing overhead.

Availability

The MAX6709MUB+T is available at Aetrix Electronics and suitable for desktop computers, telecommunications equipment, and industrial PLCs requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.

Supply support for MAX6709MUB+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications - with emphasis on high-reliability, low-power solutions for computing and communications infrastructure.

The MAX6709MUB+T belongs to Maxim's voltage supervisor product line, engineered specifically for multivoltage system power integrity assurance - delivering accurate, independent monitoring of up to four rails with minimal external components and ultra-low quiescent current.

FAQ

What is the exact threshold voltage for the IN2 pin on the MAX6709MUB+T?

The IN2 pin on the MAX6709MUB+T is factory-trimmed for a nominal 3.0V supply with ±10% tolerance, resulting in a guaranteed trip range of 2.55V to 2.70V as the input voltage decreases. This threshold is laser-trimmed during production and does not require external calibration - the MAX6709MUB+T datasheet specifies this value under ELECTRICAL CHARACTERISTICS (Table 1, V_TH for 3.0V (-10%)).

Can the MAX6709MUB+T monitor a 1.2V supply, and how is it configured?

Yes, the MAX6709MUB+T can monitor a 1.2V supply using one of its adjustable inputs (IN1, IN3, or IN4) with an external resistor divider. Since the internal reference is 0.623V (typ), a divider ratio of R1/R2 = (1.2V / 0.623V) − 1 ≈ 0.925 sets the correct threshold - the MAX6709MUB+T then asserts the corresponding PWRGD output low when the 1.2V rail drops below its trip point.

Does the MAX6709MUB+T provide reset timing or manual reset capability?

No, the MAX6709MUB+T does not include reset timing or manual reset (MR) functionality - those features are exclusive to the MAX6714 family. The MAX6709MUB+T provides only four independent open-drain PWRGD outputs with no integrated timeout or MR input; for reset generation, a separate reset IC or the MAX6714 variant must be used alongside the MAX6709MUB+T.

What is the maximum sink current supported by the PWRGD outputs of the MAX6709MUB+T?

The PWRGD outputs of the MAX6709MUB+T are open-drain and specified to sink up to 2mA while maintaining VOL ≤ 0.3V at VCC = 5V (per datasheet Table 1). This allows direct interfacing with standard CMOS/TTL logic inputs and supports wire-OR configurations with external pullups to voltages up to 5.5V - the MAX6709MUB+T internal 10µA pullup is intended for light-load or floating-bus scenarios only.

Is the MAX6709MUB+T pin-compatible with other variants in the MAX6709 family?

Yes, all MAX6709 variants including the MAX6709MUB+T share identical 10-pin µMAX pinout and package dimensions - differences are limited to factory-programmed threshold configurations (e.g., IN1/IN3/IN4 adjustable, IN2 fixed at 3.0V ±10%). This allows drop-in replacement across the MAX6709 series during design iteration or supply chain substitution without PCB layout changes.